I ended up trading in my Final Fantasy XIII-2. I was unlikely to play it again, and I could get extra for it because it was within two weeks of release. I got this instead.
Either you know this series and want it already, or you don't and you won't be interested. It's a bullet hell shoot-em-up, one of the more well-known ones. As of yesterday (17 Feb 2012) it was on sale in Gamestation for £10, so if you want it, now is the time. It comes with the soundtrack as is customary.
I've played a single game so far and it's pretty much just more of the same, so you know if you'll like it or not. Have at.